is tautomer of D-methionine D-methionine zwitterion InChI=1S/C5H11NO2S/c1-9-3-2-4(6)5(7)8/h4H,2-3,6H2,1H3,(H,7,8)/t4-/m1/s1 chebi_ontology 149.21100 D-methionine MetaCyc:CPD-218 FFEARJCKVFRZRR-SCSAIBSYSA-N C5H11NO2S 0 149.05105 CHEBI:57932 Zwitterionic form of D-methionine arising from transfer of a proton from the carboxy to the amino group; major species at pH 7.3. CSCC[C@@H]([NH3+])C([O-])=O (2R)-2-ammonio-4-(methylsulfanyl)butanoate (2R)-2-azaniumyl-4-(methylsulfanyl)butanoate methionine zwitterion